Fig. 5: Temperature dependence of the electronic magnetic Grüneisen parameter.
From: Spin liquid and ferroelectricity close to a quantum critical point in PbCuTe2O6
Electronic magnetic Grüneisen parameter ΓB,e as a function of temperature for PbCuTe2O6 single crystal #5(b) in a semi-logarithmic representation. Raw data were taken by applying small field ramps of ΔB = ±0.03 T on top of a dc field of B = 0.1 T (black squares) and 0.2 T (red triangles) applied along [110], see “Methods” and Supplementary Note 2 as well as ref. 42 for details on the technique applied. A minimum dc field of 0.1 T was used to avoid issues associated with remnant fields of the magnet. Broken line shows a fit T-m with m = 3.9 to the data for T ≤ 0.25 K. Error bars result from averaging over field-up and field-down sweep. The inset (left ordinate) shows the ratio αsc/Csc = α[110]/Csc for single crystal #5 (open red squares) and αpd/Cpd for the pressed-powder sample pd #Ι (open orange spheres) both measured at B = 0. Errors are calculated from the errors of α and C. The inset also shows results for the magnetization M(T) (right ordinate) per mole in a field of B = 0.1 T along the [110] direction of sc #5(b) obtained by ac-susceptibility measurements. Representative error bar, denoting standard deviation due to statistical treatment of raw data.
